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Commit f6b3597b authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: x86 emulator: add macros for executing instructions that may trap 



Like DIV and IDIV.

Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 739ae406

arch/x86/kvm/emulate.c

+43 −0
Original line number Diff line number Diff line
@@ -331,6 +331,27 @@ struct group_dual { 
			  "a" (_rax), "d" (_rdx));			\

	} while (0)



#define __emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, _eflags, _suffix, _ex) \

	do {								\

		unsigned long _tmp;					\

									\

		__asm__ __volatile__ (					\

			_PRE_EFLAGS("0", "5", "1")			\

			"1: \n\t"					\

			_op _suffix " %6; "				\

			"2: \n\t"					\

			_POST_EFLAGS("0", "5", "1")			\

			".pushsection .fixup,\"ax\" \n\t"		\

			"3: movb $1, %4 \n\t"				\

			"jmp 2b \n\t"					\

			".popsection \n\t"				\

			_ASM_EXTABLE(1b, 3b)				\

			: "=m" (_eflags), "=&r" (_tmp),			\

			  "+a" (_rax), "+d" (_rdx), "+qm"(_ex)		\

			: "i" (EFLAGS_MASK), "m" ((_src).val),		\

			  "a" (_rax), "d" (_rdx));			\

	} while (0)



/* instruction has only one source operand, destination is implicit (e.g. mul, div, imul, idiv) */

#define emulate_1op_rax_rdx(_op, _src, _rax, _rdx, _eflags)			\

	do {									\
@@ -342,6 +363,28 @@ struct group_dual { 
		}							\

	} while (0)



#define emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, _eflags, _ex)	\

	do {								\

		switch((_src).bytes) {					\

		case 1:							\

			__emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx,	\

						 _eflags, "b", _ex);	\

			break;						\

		case 2:							\

			__emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \

						 _eflags, "w", _ex);	\

			break;						\

		case 4:							\

			__emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \

						 _eflags, "l", _ex);	\

			break;						\

		case 8: ON64(						\

			__emulate_1op_rax_rdx_ex(_op, _src, _rax, _rdx, \

						 _eflags, "q", _ex));	\

			break;						\

		}							\

	} while (0)



/* Fetch next part of the instruction being emulated. */

#define insn_fetch(_type, _size, _eip)                                  \

({	unsigned long _x;						\